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(No Model.) 3 Sheets-Sheet 1.

H. H., H. L. L L. G. HANCOCK. ROCK DRILL.

No. 603,529. 'Patented May 3,1898..

(No Model.) 3 Sheets-Sheet 2.

H. RWH. L. 8u L. C; HANCOCK.

ROCK DRILL. No. 603,529. Patented xxxx u C a im m i i I i E a i .III

llrgmgmg mlnmulm I 'umllul mum . 3 Sheets-Sheet 3. H. R., H. -L. 8v L. G. HANCOCK. ROCK DRILL.

i i UNITED STATES PATENT Orrrcn.

HENRY RICHARD HANCOCK, HENRY LIPSON HANCOCK, AND LEIGH GEORGE HANCOCK, OF MOONTA MINES, SOUTH AUSTRALIA.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 603,529, dated May 3, 1898.

v Application iiled September 2,1897. Serial No. 650,391. (No model.)

To @ZZ whom it may concern,.-

Beit known that we, HENRY RICHARD HAN- COCK, mine superintendent, and HENRY LIP- soN HANCOCK and LEIGH GEORGE HANCOCK, mining engineers, subjects of the Queen of Great Britain, residing at Moonta Mines, in the Province of South Australia, have invented certain new and useful Improvements in Rock-Drills and other Like Machines, of which the following is a full, clear, and exact description.

Our invention relates to certain improvements in direct-acting machines driven by air or steam pressure. For convenience we propose to describe it with reference to rockdrills driven by compressed air, to which it is intended more particularly to refer; but it may also be applied to any direct-acting machine, suoh as pumps driven by steam.

With the drills and other like machines at present in use considerable difficulty is eX- perienced in preventing leakage of the compressed air. Owing also to the multiplicity of the parts employed in the construction of the drill a further considerable amount of power is lost by friction, and when the cylinder becomes worn the machine can only be ,by the action of the drill-piston; (c) by a general simplification of the parts which we are enabled to effect by means of our improved inlet-valve, and (d) by providing the cylinder with a removable liner which can be readily replaced when it lbecomes worn.

Inrthe accompanying drawings, illustrating our invention, Figure I is a plan of the drillingmachine complete; Fig. II, an elevation of the machine, showing the exhaust-openin gs covered with Stoppers; Fig. III, a longitudinal section ,showing the internal parts of the machine, but without the internal liner to the cylinder; Fig. IV, a horizontal section of the cylinder along the lines d d in Fig. II, showing air-ports and slot-hole for the valve-spindle, also the position of the exhausts; Fig. V, a cross-section throughthe parts marked a a in Fig. I, showing valve-spindle in position and air-ports Fig.VI, a cross-section through b b, Fig. I, showing the air-port admitting air to the piston-chamber; Fig. VII, a longitudinal section along a line c c, Fig. .1, showing` the valve in section and piston and valve-spindle actuated by the same, together with the action of the piston of the valve-spindle at the end of the instroke; Fig. VIII, a longitudinal section of the same, showing the action of the piston of the valve and valve-spindle at the end of the outstroke; Fig. IX, details of the valve, the valve-spindle being removed in order to show the ports more clearly; Fig. X, a longitudinal section of the cylinder of the machine with removable liner inserted; Fig. XI, a cross-section along a line e e in Fig. X,

showing the slot-hole-for the valve-spindle f and the cylinder with inner lining; Fig. XII, a plan of the removable cylinder-liner, showing the slot-hole for the valve-spindle and openings at each end leading from the airports; Figs. XIII and XIV, elevations of the front and rear ends of the removable cylinder-liner, showing the position of the portsg Fig.XV, an end elevation of rifle-bar, ratchet- Wheel, and pawls for holding the bar in posi-v tion during the back stroke of the piston.

Similar letters of reference referto similar parts in all the figures.

Our improved rock-drill is mounted upon a bed-plate or cradle, along which the maof the machine, having an internal cylin-;

der B, in which works a piston C, as more particularly described later. The cylinder B IOO is provided with two exhaust-openings B B2, Figs. III and X. At either end of the cylinder B are air-ports D D', Figs. III and X, leading from the cylinderB to the inlet-Valve chamber A2, formed in the body of the machine at A. The inlet-Valve chamber A2, Figs. X and XI, is cylindrical and is provided at either end with suitable removable caps A3, fastened to A. The inlet-valve E has a rocking motion, causing it to partially rotate in the inlet-valve chamber A2, permitting the airto enter from the valve first into one and then the other of the ports-D D. The details of the construction of the valve E,which consists of an open-ended tubular piece, are shown more particularly in Fig. IX. The

compressed air from the air-compressor is introduced into the interior of valv-eEthrough a chlannel A3, formed in the side of the casingy cap A, is provided at the opposite en d of the valve-chamber A2, kso that thecompressedair can be introduced from either side. The head of the machine at A is provided witha circular opening closed by a removable cap A7 in order to permit access to the interior of the-valve E and to the valve-spindle F through a circular opening E'. The lcompressed air passing into the interior of the valve E through either of the channels A3 or A4 iiows through one or other of the openings E2/E3, formed in the lower portion of the valve, intov one or other of the ports D D', with which the openings E2 E3 correspond. In order to automatically impart a rockingmotion to the valvefE, causing it to partially rotate, `so las to bring alternately the opening .Ef2 opposite the/port D and the opening E3 opposite .the port D' andtoadmit the -compressed air alternately to one or the other, the valve E is. brought lin communication with the piston C by a valve-.spindle F. Thjis valve-spindle F is tightly fastened to the valve E by having ascrew-thread formed upon it, Figs. VII and VIII, and by being tightly screwed into an opening E4, having an internal screw-thread provided for the purpose in the lower part of the valve E. A washer and screw-head to the valve-spindle prevent any leakage 0f .the air. The valve-spindle F projects downward into the cylinder B through a slot A5, provided for the purpose in the body of the machine A, as shown more particularlyin Figs. V, VII, VIII, and XI,-and is actuated by the movement of the piston C.

The piston C is provided with spring-rings in the ordinary way formed in the heads G C2, the body of the piston C between the heads C C2 being recessed in order to allow room for the valve-spindle F. The compressed rair entering the valve E, as before described, through either vof the channels A3 A4 flows through the valve-openingE2, (if that is then open,) through the port D into the rear end of the cylinder B, driving forward the piston C until the head C has passed the exhaust B', from which thel air then escapes. At the A similar channel A4, closed with aV Sametime the piston-headG', pressing against the valve-spindle F, causes the valve E to partially rotate, shutting the port D and opening the port Dl by bringing the valve-opening E3 opposite to it. The compressed air then flows in the front end of the cylinder B, and by its pressure upon the head C2 drives the piston back until the exhaust B2 has been opened, allowing the air to again escape. Meanwhile the head C2, similarly engaging the valve-spindle F, again causes the valve to partially rotate, closing the port D and Iagain opening the port D, and so on alternately driving the piston backward and forward. To the piston C is attached the piston-rod, to which the drill is fixed.

We nd in practice that in order to secure good despatch with the return stroke of the piston Gand to economize air one and thirteen-sixteenths inches is a very suitable diameter for the piston-rod, but do, not bind ourselves to any dimensions.

The head C of the piston C is constructed Withinternal rillin g corresponding with similar grooves formed in the rifle-bar H, Fig. III, by means 0f which a rotatory motion is iin- -parted to the drill on the back stroke in the usual manner. Upon the head ofthe riliebar H is fixed a ratchet H', provided with pawls H2 for yholding the ratchet in position during the back stroke of the piston G, while allowing it to slide forward during the forward stroke of the piston C. This, however, isof usualconstrnction for suchpurpose and forms no part of our invention.

In practice, owing lto the action of the piston-heads C C', the interior of cylinder B becomes worn, allowing the air to leak past the piston-heads, and thus causing loss of power and interfering with the efficiency. of the drill. In-the-drills at present in use the whole cylinder when Worn has to be replaced. To obviate this, weon occasionconstruct the cylinder of our improved drill with a removable internal lining I, ,asshown more particularly in Figs. X,- XI, XII, XIII, and XIV. This removable lining I is provided with an opening I', through which the valve-spindle passes,

.with holes corresponding with the exhaust B B2, and with openings I2 I3, corresponding with the outlet ends of the ports D D. As the internal face of the lining I becomes worn by the action of the cylinder-heads a fresh lining can be easily fixed in its place and the efficiency 0f the drill thoroughly restored at small expense.

Having now particularly described and ascertained the nature of our said invention and in-what manner the same is to be performed, we declare that what we claim is- 1. In a rock-drill, the combination with a working cylinder provided with a cylindrical valve-chamber and passages leading from said valve-chamber to opposite ends of the working cylinder, of a hollow cylindrical valve working in said valve-chamber, said valve being provided with ports which regis- Vsubstantially as described.

2. In a drill or similar machine, the combination with a working cylinder provided with a cylindrical valve -chamber and passages leading from said valve-chamber to opposite ends of the working cylinder, an opening in the top of the said chamber, and a screw-cap for said opening, of a hollow cylindrical valve working in said valve-chamber, said valve being provided with ports which register with the aforesaid passages, and provided also with an opening A7, in its top, a spindle F, tapped through an opening E4, in the lower wall of the valve, a fluid-supply openin g leading into one end of the hollow valve, and a piston in the working cylinder, said piston being arranged to operate the valve-spindle, substantially as described.

3. In a rock-drill, the combination with a cylindrical valve-chamber formed in the body of the machine and provided with oppositelydisposed side openings A3, A4, and a cap A6, adapted to close either of said openings, of a hollow cylindrical valve having open ends registering with said side openings in the valve-chamber and provided also with passages which have communication with opposite ends of the working. cylinder, a piston in the working cylinder, and a connection between said valve and piston, for the purpose specified.

4. In a rock-drill or similar machine, the combination with a workin g cylinder provided with a cylindrical valve-chamber and pas-I sages leading from said valve-chamber to opposite ends of the working cylinder, of ahollow cylindrical valve working in said charnber and provided with ports which register with the aforesaid passages, a fluid-supply opening leading into the hollow valve, a piston in the working cylinder, and exhaustopenings in the cylinder so disposed that the working fluid exhausts at either end of the stroke of the piston, substantially as described.

5. In a rock-drill or the like, the combination with aworking cylinder provided with a cylindrical valve-chamber and passages leading from said valve-chamber to opposite ends of the working cylinder, of a hollow cylindrical valve working in said chamber, said valve being provided with ports which register with the aforesaid passages, a valve-operating spindle tapped into the hollow valve and depending into the working cylinder, a removable lining for the working cylinder, said lining being provided with openings I2 I3, at its opposite ends which register with the passages leading from the valve-chamber, and provided also with a slot I', for the valvespindle, and a piston in the working cylinder, said piston being arranged to engage and operate the valve-spindle, substantially as described.

In witness whereof we have hereunto set our hands in presence of two witnesses.

HENRY RICHARD HANCOCK. HENRY LIPSON HANCOCK. LEIGH GEORGE HANCOCK.

Witnesses:

ANNIE TAYLOR UFFINDELL, l KATIE WINIFRED LoUIsA PoTTs. 

